Sight-feed lubricator.



PATBNTED MAY 15, 1906.

SIGHT FEED LUBRIGATOR. APPLICATION FILED NoV.18., 19o5.

M25/aye FREDERICK LEONHARDT, OF SHEBOYGAN, I/VISCONSIN.

SIGHT-FEED LUBRICATOR.

Specification of Letters Patent.

Patented May 15, 1906.

Application led November 18, 1905. Serial No. 287,932.

T0 all whom, it may concern,.-

Be it known that I, FREDERICK LEON- HARDT, a citizen of the UnitedStates, and a resident of Sheboygan, in the county of Sheboygan andState of Wisconsin, have invented certain new and useful Improvements inSight-Feed Lubricators, and I do hereby declare that the following is afull, clear, and exact description thereof.

My invention consists in certain peculiarities of construction andcombination of parts hereinafter set forth with reference to theaccompanying drawings and subsequently claimed, its object being toprovide against fracture of glass in sight-feed tubes of lubricators andin case of fracture to prevent particles of glass from flying, as wellas to facilitate the substitution of one such tube for another in alubricator and to avoid the necessity of exact measurements with respectto the dimensions of the substitute tube.

Figure 1 of the drawings represents a fragment of an improved lubricatorpartly in section, and Fig. 2 an elevation of the sight-feed tube of thelubricator partly broken away.

Referring by letter to the drawings, A indicates the oil-reservoir, andB C the feed-tube holders, of a lubricator. The upper tubeholder B isclosed at the top by a screw-plug D, and a packing-ring Eis compressedagainst the lower end of said holder by a sleeve-nut F, run on anexterior thread of same. A similar ring G is compressed against theupper end of the lower tube-holder C by a sleevenut H, run on an outerthread of said holder, and by means of said packing-ring and nuts thesight-feed tube is made fluid-tight in both holders for the same.

The sight-feed tube comprises an outer metallic jacket I, of cylindricalform, interiorly screw-threaded at its ends and provided with aperturesb midway of its length, a glass shell J in the jacket visible throughthe apertures of same, packing-gaskets K, opposing the ends of theshell, and hollow nuts L run in said jacket against the gaskets, shanksc of the nuts being extended through said gaskets to bush the same andproject into said shell. Particular attention is called to the fact thatthe glass shell, packing-gaskets, and nuts of the sight-feed tube arewholly within the outer jacket portion of said tube, so as to precludethe possibility of undue pressure on said shell longitudinally of thesame, and the position of said tube in practice is such that there is nobind upon its To position the sight-feed tube, as partof the lubricator,the` screw-plug D of the tube-holder B is removed and the sleevenuts F Hloosened, after which said tube is dropped into place, said nutstightened, and said plug put back in said holder. The bind of thepacking-rings F G is circumferentially of the outer metallic jacketportion of the sight-feed tube, and the length of this tube as a wholeis immaterial so long as it is made to extend in opposite directionsthrough said rings. Hence accuracy of length of the sight-feed tube withreference to the distance between the tube-holder of a lubricator is notessential, and it has been explained how an otherwise too short a tubemaybe lengthened.

It is to be noted that one end of the sightfeed tube is free in theremainder of the lubricator, and thus said tube is unimpeded as tolongitudinal expansion, this being an important feature of my invention.

To compensate for expansion and contraction, the glass shell of thesight-feed tube is of sufficiently less diameter than the jacket, inwhich it is made fluid-tight 'by the packinggaskets and nuts aforesaid,and the expansion and contraction of said jacket and that of thetube-holders is never detrimental to said glass shell. However, shouldthere be a fracture of the aforesaid shell the jacket for the same willprevent the flight of particles of glass. As herein shown, the glassshell may be comparatively short, and this of itself tends to lessen theliability of said shell to fracture under the conditions to which it isexposed when the lubricator is in service.

It is a very simple matter to remove an unserviceable sight-feed tubeand substitute a newone of the construction aforesaid regardless ofaccuracy as to the length of said new tube, provided it is long enoughto extend through both of the packing-rings aforesaid when dropped inthrough the upper tubeholder from which the screw-plug closure istemporarily removed.

TOO

IIO

I claim-- 1. A sight-feed tube Jfor a lubricator comprising an outermetallic jacket having the ends thereof interiorly screw-threaded7 aglass shell Within the jacket visible through apertures in the same,packing-gaskets opposing ends of the shell, and hollow nuts that engagethe screw-threads of said jacket against the gaskets and have hollowShanks extending through said gaskets to bush the same and project intosaid shell.

- 2. A lubricator having packing-rings opposing ends of its feed-tubeholders, sleevenuts in connection with said holders against thepacking-rings, and a sight-feed tube comprising an outer metallic jacketextending in opposite directions through said rings and FREI).LEONHARDT.

`Witnessesz N. E. OLIPHANT, GEORGE FELBER.

